Update mbed_targets.md

Edit file for minor formatting.

Author: Amanda Butler

docs/reference/configuration/mbed_targets.md

@@ -193,9 +193,12 @@ Enabling `is_disk_virtual` adds delay after flashing firmware binary to make sur
 #### supported_toolchains
 
 The `supported_toolchains` property is the list of toolchains that support a target. The allowed values for `supported_toolchains` are `ARM`, `uARM`, `ARMC5`, `ARMC6`, `GCC_ARM` and `IAR`.
-If you specify `ARMC5` in `supported_toolchains` it means the corresponding target supports `Arm Compiler 5.06 update 6`.
-If a target lists both ARMC5 and ARM(or ARMC6) in `supported_toolchains`, the ARM Compiler 6.11 will be used when compiling with `ARM` option for `--toolchain`.
-Note that although you can specify `ARMC5` in `supported_toolchains` in `targets.json`, it's not a valid option for `--toolchain` when compiling using [Mbed CLI](../tools/developing-mbed-cli.html).
+
+If you specify `ARMC5` in `supported_toolchains`, it means the corresponding target supports `Arm Compiler 5.06 update 6`.
+
+If a target lists both ARMC5 and ARM (or ARMC6) in `supported_toolchains`, the ARM Compiler 6.11 will be used when compiling with `ARM` option for `--toolchain`.
+
+<span class="notes">**Note:** Although you can specify `ARMC5` in `supported_toolchains` in `targets.json`, it's not a valid option for `--toolchain` when compiling using [Mbed CLI](../tools/developing-mbed-cli.html).</span>
 
 #### default_toolchain
 
@@ -433,4 +436,4 @@ The `orphans` command shows all targets that you cannot reach from a public targ
 
 ### Related content
 
-- [Developing: Mbed CLI](../tools/developing-mbed-cli.html)
+- [Developing: Mbed CLI](../tools/developing-mbed-cli.html).